/**
 * Tencent is pleased to support the open source community by making TubeMQ available.
 * <p>
 * Copyright (C) 2012-2019 Tencent. All Rights Reserved.
 * <p>
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.tencent.tubemq.server.common.utils;

import java.util.Arrays;

/**
 * This class encapsulates a byte array and overrides hashCode and equals so that it's identity is
 * based on the data rather than the array instance.
 */
public class HashedBytes {

    private final byte[] bytes;
    private final int hashCode;

    public HashedBytes(byte[] bytes) {
        this.bytes = bytes;
        hashCode = WritableComparator.hashBytes(bytes, bytes.length);
    }

    public byte[] getBytes() {
        return bytes;
    }

    @Override
    public int hashCode() {
        return hashCode;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }
        HashedBytes other = (HashedBytes) obj;
        return Arrays.equals(bytes, other.bytes);
    }

    @Override
    public String toString() {
        return Bytes.toStringBinary(bytes);
    }
}
